The Calculation of Turn-On Overvoltages in a High Voltage dc Thyristor Valve

A method of calculating turn-on over- voltages in a high-voltage dc valve, as well as a computer program to perform the calculations, is presented. The effect of critical system and valve parameters on turn-on over- voltages is shown through results of calculations for a representative thyristor valve. The techniques presented are a powerful tool for valve design, and for optimization of system and valve parameters.